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- Problem) A university student is studying the inheritance of 2 genes of pea plants. Color of plant: Blue is dominant (B), and yellow is recessive (b) Spikes or no spikes: Having spikes is dominant (G), and having no spikes is recessive (g). Which of the following findings would indicate to the student that these two traits are located close together on the same chromosome? a) The traits show independent assortment b) All gametes of a double heterozygous individual (BbGg) are either BG or bg c) A double heterozygous individual has four types of gametes in approximately equal proportions: BG, Bg, bG, and bg d) Student finds that there is frequent crossing over between the 2loci7- In peas, a tall, yellow- seeded plant is crossed with a homozygous short, green- seeded plant and yields 203 tall, green-seeded plant, 199 short, green seeded plants, 207 tall, yellow-seeded plants, and 192 short, yellow-Seeded plants. The most likely genotype of the tall, yellow-seeded plant is.. [EXPLAIN by drawing the punnett square that reflects this phenomena then select the right answer/4 a) TtYy b) TTYY c) Ttyy d) ttYYHow many Barr bodies are present in the interphase cells of the ff. individuals? A) Klinefelters where 2n = 48 (assume no autosomal aneuploidy in this individual) (b) metafemales with chromosome number of 48 (no autosomal aneuploidy in this individual). Show solutions.
- 3)The inability to synthesise chlorophyll is a recessive characteristic in tobacco plants. If a tobacco plant know to be heterozygous is self pollinated, and 600 of its seed were germinated, a) how many would you expect to produce albino (completely unpigmented) plants? b) how many would be expected to have the parental genotype? c) why is this cross the only way to produce albino tobacco plantsHelp meNicotiana tabacum is presumed to be an allotetraploid originating from a cross between N. sylvestris (the S genome) and N. tomentosa (the T genome). Each of the two parental species (2n = 24) contributed 12 chromosomes (S & T), which then doubled to form the 24 pairs of chromosomes observed in N. tabacum. a) Diagram the entire cross starting with the original parents until the formation of N. tabacum. Distinguish between chromosomes of N. sylvestris and N. tomentosa and give the chromosome number of all individuals in the cross. Include gametes in your crosses. b) A monosomic N. tabacum is crossed with N. sylvestris and produces offspring, some with 36 chromosomes and some with 35 chromosomes. Using cytological examination at meiosis, the 35-chromosome types show 11 bivalents and 13 univalents. Is this plant monosomic in the S or T genome? Show why it cannot be the other genome as part of your solutions